地磁日变不同时段特征差异及对地磁日变改正的影响

doi:10.11720/wtyht.2023.1138

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Abstract

The phase difference (i.e., time difference) and amplitude difference between the geomagnetic data of the offshore work area and the geomagnetic diurnal variation data of the remote stations are still challenges to the precision of the marine magnetic survey network. Based on the stations on both sides of the East China Sea and three stations in Europe at higher latitudes, this study analyzed and made statistics on the numerical differences in morphological characteristics, phase differences, and amplitude differences of the diurnal variation curves during the daytime, nighttime, and the periods of intense magnetic disturbance. The results are as follows. During the daytime, the phase difference between the stations is constantly changing, resulting in a large amplitude difference around noon. During the nighttime, the data of the stations have consistent phases, and the amplitude difference is mostly less than 4 nT. During strong magnetic disturbance activities such as magnetic storms, the phases of the stations are consistent, and the amplitude difference is even smaller than that during quiet days. According to the survey data of the ocean, the absolute value of the difference at intersections between the survey lines during magnetic storms and quiet days is less than 3.2 nT. The variation characteristics of the phase difference and amplitude difference of the geomagnetic diurnal data between stations facilitate the diurnal variation correction of the marine geomagnetic data.

Key words： correction of geomagnetic diurnal variation marine magnetometry phase amplitude

Received: 29 March 2022 Published: 24 February 2023

ZTFLH:

P631

Corresponding Authors: FU Yong-Tao E-mail: lixingkang5555@163.com;ytfu@qdio.ac.cn

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	Xing-Kang LI
	Yong-Tao FU
	Zhang-Guo ZHOU
	An YANG

Cite this article:

Xing-Kang LI,Yong-Tao FU,Zhang-Guo ZHOU, et al. Differences in the characteristics of geomagnetic diurnal variation in different periods and their influence on correction of geomagnetic diurnal variation[J]. Geophysical and Geochemical Exploration, 2023, 47(1): 135-145.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2023.1138 OR https://www.wutanyuhuatan.com/EN/Y2023/V47/I1/135

Geographic location information for three European stations

Three stations in Europe (square: CLF station; diamond: BFO station; circle: FUR Station)

Geographical location of Zhoushan Huaniao Island temporary station (five-pointed star) and Kagoshima Kagoya geomagnetic station (triangle)

Geomagnetic diurnal variation curves (a) and Kp index (b) of CLF station in France and BFO station in Germany from 30 to 31 July 2019

Geomagnetic diurnal variation curves (a) and Kp index (b) of CLF station in France and FUR station in Germany from 17 to 18 August 2019

Geomagnetic diurnal variation curves (a) and Kp index (b) of Zhoushan Huaniao Island station and Kagoshima Kagoya station from 13 to 14 August 2019

Geomagnetic diurnal variation curves (a) and Kp index (b) of CLF station in France and FUR station in Germany from 3 to 4 September 2019

Geomagnetic diurnal variation curves (a) and Kp index (b) of Zhoushan Huaniao Island station and Kagoshima Kagoya station from 27 to 28 September 2019

Geomagnetic diurnal variation curves (a) and Kp index (b) of Zhoushan Huaniao Island station and Kagoshima Kagoya station from 27 to 28 August 2019

Geomagnetic diurnal variation curves (a) and Kp index (b) of CLF station in France and FUR station in Germany from 30 to 31 July 2019

Geomagnetic diurnal variation curves (a) and Kp index (b) of Zhoushan Huaniao Island station and Kagoshima Kagoya station from 30 to 31 July 2019

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